StarCraft II fans beware: there are fraudsters pretending to be Blizzard that want to steal your Battle.net account.
These people are referred to as "phishers" and they send authentic-looking emails promising a StarCraft II CD-key, according to Siliconera.
One specific scam creates a phony Battle.net log-in screen and directs you there from a step-by-step CD-key activation procedure in the email. Any usernames or passwords submitted will fall straight into the delicate-yet-dastardly hands of the scammers.
How to spot a fraud? Check you're on the Battle.net official URL when logging in, and always double-check the sender's email address for authenticity. By and large, Blizzard and Battle.net won't send many account-related emails.